Evolution

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Evolution

Image by Bushman.K
Two buttons produced in distinct times with slightly various logos. Produced by Allen-Bradley (presently, part of Rockwell Automation). Logo on the left still has decorative element – curved line with underscore, that goes from horizontal dash in &quotA&quot, like in original 1924 logo. Stop button appears more modern day, but letters nevertheless have serifs, although later logo, employed prior to acquisition by Rockwell, functions sans-serif font.

Grinding mill, 1637

Image by Marcel Douwe Dekker
Supply: Song Yingxing (1637) Tiangong Kaiwu, part three on agriculture and milling processes